public class Vehicle {

	int state;	    // key
	String id;	    // key
	String make;
	String model;
	int year;

	public boolean equals( Object obj ) {
		if ( obj instanceof Vehicle ) {
			Vehicle other = (Vehicle)obj;
			return state == other.state && id.equals( other.id );
        	}
		else {
			return false;
		}
	}


	public int hashCode() {
		return state + id.hashCode();
	}

}